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03/13/2007 09:33:00 PM · #26 |
It goes into the cup...but it's volume is already accounted for even when it was a solid..The volume does not change.
Originally posted by skylercall: Yes but what about the top half of the ice that is floating above the surface of the water? Where does it go when it melts? |
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03/13/2007 09:42:03 PM · #27 |
That's great! I have to try that
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03/13/2007 09:59:24 PM · #28 |
I guess I should have explained... Ice normally (always) floats in water. Whenever something is floating in water, the weight of it will cause the water level to rise (because the weight pushes down on the water). I don't know about other substances, but at least with ice the amount of water it displaces (how much the water level rises) should be EXACTLY the same as the amount of water the ice cubes contain, so that when they melt the water level should remain exactly the same.
Originally posted by kenskid:
As far as the level changing as the ice melted....it did not change. The way the ice was positioned and moving did not allow you to accuratly see the level at all times. |
You must be right about the water level not changing since you know... that's the laws of physics... but I think that while you can't see the level at all times, you CAN see it at different times, which would allow you to see if the water level was going up, down, or remaining the same.... I think maybe it's just an optical illusion? I still don't get why it looks like the water level is going up.
EDIT: DOY! I'm so stoopid. I just realized why the water level goes up!!! If you look at the gif, you can barely make out the fact that there is so much ice on the cup that it is actually touching the bottom of the glass... which means that all of the ice isn't actually floating on the water! Once the ice melts enough so that it is no longer being supported by the bottom of the glass, the water level doesn't change.
second EDIT: I just realized that different substances DO affect the displacement of water, which is what ... Archimedes? realized when he discovered the specific density (or is it the specific gravity? darn. I forgot. I'm a biology person not a physics person :P) of objects.
Message edited by author 2007-03-13 22:01:51. |
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03/13/2007 10:12:07 PM · #29 |
Cool TL!
I have a few on Shutterstock if anyone's interested. This one might be appropriate. There's a bunch more in my gallery, here. |
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03/13/2007 10:14:29 PM · #30 |
Originally posted by PDF:
EDIT: DOY! I'm so stoopid. I just realized why the water level goes up!!! If you look at the gif, you can barely make out the fact that there is so much ice on the cup that it is actually touching the bottom of the glass... which means that all of the ice isn't actually floating on the water! Once the ice melts enough so that it is no longer being supported by the bottom of the glass, the water level doesn't change.
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like I said, too much ice.
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03/13/2007 10:18:24 PM · #31 |
Originally posted by hyperfocal: Slow day at work, so I thought I'd play with the Interval timer (intervalometer) built into my Nikon D200.
Link-
Two hours compressed into 9 seconds |
Linkie no longer work?
MattO
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03/13/2007 10:21:12 PM · #32 |
Originally posted by boysetsfire: like I said, too much ice. |
Oh... sorry. I thought you meant something else. |
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03/13/2007 10:59:02 PM · #33 |
Sam Javanrouh has a photoblog, and he's posted a few of his own timelapse videos. I think he usually lists the programs, hardware or at least a little blurb about how he did them too. Here is his latest of parking traffic.
He has others listed in his archives too. Check the top section of 'flash enabled' and also the very bottom for 'timelapse photography' and 'video attached'.
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03/14/2007 07:59:19 AM · #34 |
Originally posted by strangeghost: Here are a few of my few of my astronomy time lapse photos. Warning, the second one is huge. Don't click unless you have broad-band. All are animated GIFs. |
I really dig the moon sequence. It reminds me of a scene in Oliver Stone's The Doors. I like the others also. Great work! |
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03/14/2007 12:09:31 PM · #35 |
Another slow day, so here goes another...
Fast Fold Screen Up & Down
Who ever named the screens fast folds must be the king of spin.
edit: grammer
Message edited by author 2007-03-14 12:11:23. |
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03/14/2007 01:24:33 PM · #36 |
Originally posted by skylercall: Yes but what about the top half of the ice that is floating above the surface of the water? Where does it go when it melts? |
The complete answer to the water level question:
When water freezes, it expands (about 8.7 percent) which is why ice floats - it's less dense. Reversing the process, when ice melts, the water that results takes up about 8% less space than the ice. That reduction in space is the same as the amount of ice originally above the surface. The water level does not change. In quantitative terms:
Fact: density of water = 1.00 g/cc
Fact: density of ice = 0.92g/cc
- We start with 1000cc (1 liter) of water in a graduated beaker and add 250g of ice (271.8cc)
- The ice displaces it's own weight (250g) in water, so when the ice is added the level of the water rises to the 1250cc mark.
- The ice melts. It is replaced by 250cc of water, and so the final level is 1000+250=1250cc. No change.
Message edited by author 2007-03-14 13:24:49. |
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03/14/2007 01:27:26 PM · #37 |
I knew I was right !
Originally posted by kirbic: Originally posted by skylercall: Yes but what about the top half of the ice that is floating above the surface of the water? Where does it go when it melts? |
The complete answer to the water level question:
When water freezes, it expands (about 8.7 percent) which is why ice floats - it's less dense. Reversing the process, when ice melts, the water that results takes up about 8% less space than the ice. That reduction in space is the same as the amount of ice originally above the surface. The water level does not change. In quantitative terms:
Fact: density of water = 1.00 g/cc
Fact: density of ice = 0.92g/cc
- We start with 1000cc (1 liter) of water in a graduated beaker and add 250g of ice (271.8cc)
- The ice displaces it's own weight (250g) in water, so when the ice is added the level of the water rises to the 1250cc mark.
- The ice melts. It is replaced by 250cc of water, and so the final level is 1000+250=1250cc. No change. |
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03/15/2007 12:43:28 PM · #38 |
Originally posted by kirbic: The complete answer to the water level question:
When water freezes, it expands (about 8.7 percent) which is why ice floats - it's less dense. Reversing the process, when ice melts, the water that results takes up about 8% less space than the ice. That reduction in space is the same as the amount of ice originally above the surface. The water level does not change. In quantitative terms:
Fact: density of water = 1.00 g/cc
Fact: density of ice = 0.92g/cc
- We start with 1000cc (1 liter) of water in a graduated beaker and add 250g of ice (271.8cc)
- The ice displaces it's own weight (250g) in water, so when the ice is added the level of the water rises to the 1250cc mark.
- The ice melts. It is replaced by 250cc of water, and so the final level is 1000+250=1250cc. No change. |
LOL, I was waiting for Kirbic to chime in with a rigorous mathematical proof! Well done.
Of course, if there is so much ice in the container that some of its weight is supported by the bottom of the container, then the water level will rise, as others mentioned.
Message edited by author 2007-03-15 12:50:52. |
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03/15/2007 06:08:44 PM · #39 |
Originally posted by boysetsfire: Originally posted by marksimms: Originally posted by gloda: Grr, that's the kind of thing I want to do with cities, but the 350D has to be connected to a laptop or a special remote. So do all Canons, I think? |
Yup, 1 - 0 to the Nikon in that department.. |
does the 5d? |
I had a Canon S2 IS before, and it had this function. So I made a few of these "movies", great fun!
Now I have the 400D/XTi, and I believe it does not have any time lapse unless connected to a computer.
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03/15/2007 11:54:47 PM · #40 |
OK...my manual is Japanese, gonna have to dl the English manual for my D80 now. Does anyone with a D80 know if time-lapse is possible with it? Very interesting stuff...
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03/16/2007 12:20:12 AM · #41 |
Originally posted by boysetsfire: Originally posted by marksimms: Originally posted by gloda: Grr, that's the kind of thing I want to do with cities, but the 350D has to be connected to a laptop or a special remote. So do all Canons, I think? |
Yup, 1 - 0 to the Nikon in that department.. |
does the 5d? |
The 5D doesn't have that feature built-in but you can add it buy getting the Timer remote controller TC-80N3. It is a remote,self-timer, interval timer and a long exposure timer all in one
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03/16/2007 12:22:41 AM · #42 |
What did you use to compress the .JPGs into a movie? |
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03/16/2007 09:20:46 AM · #43 |
Originally posted by theSaj: What did you use to compress the .JPGs into a movie? |
Quicktime Pro, the best $30 you'll ever spend on software.
BTW Canon guys & gals I thought the 30D had an interval timer built-in? |
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03/16/2007 11:00:42 AM · #44 |
Originally posted by heavyj: OK...my manual is Japanese, gonna have to dl the English manual for my D80 now. Does anyone with a D80 know if time-lapse is possible with it? Very interesting stuff... |
I don't think so, at least not built in.
I'd be interesting in knowing how to do it with a D80 if is possible to set it up with capture software or something. |
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03/16/2007 12:42:47 PM · #45 |
Originally posted by hyperfocal:
BTW Canon guys & gals I thought the 30D had an interval timer built-in? |
Not that I know of, but I've never checked since I have the excellent TC-80n3 remote timer.
BTW, I use iPhoto to assemble time-lapse photos into a quicktime movie (still uses Quicktime though). Unfortunately, iPhoto doesn't have the ability to build a GIF animation, which would be my prefered mode to present these (compatible with more systems). |
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03/16/2007 12:49:31 PM · #46 |
Originally posted by amirt: Originally posted by heavyj: OK...my manual is Japanese, gonna have to dl the English manual for my D80 now. Does anyone with a D80 know if time-lapse is possible with it? Very interesting stuff... |
I don't think so, at least not built in.
I'd be interesting in knowing how to do it with a D80 if is possible to set it up with capture software or something. |
There are several options for the D80/70s and even the D50/40/70. The Pclix LT100 is the most reasonable @ $140 plus another $30 for the cable for the D80/70s. You can use the $20 cable for IR remote, but battery usage is a real issue with time-lapse and the camera uses quite a bit more power when in IR receiving mode. Of course IR is the only way to go with the D50/40/70.
The Time Machine is another option, but it is much more expensive ($265-400 depending on options). It however will allow you to do much more than just time-lapse, like capturing water drops, speeding bullets, measuring flash durations, etc. |
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03/16/2007 12:54:49 PM · #47 |
thank you...
this hobby just keeps getting more and more expensive. |
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03/16/2007 05:48:06 PM · #48 |
Ah yes. I discovered the same toy on the D200 just in time for the lunar eclipse at the start of March.
What's really neat is being able to intersperse your own shots between times, in addition to the ones it's taking.
(D200, 62 original images; as topic poster, a PS Action to minimally convert them to TIFF, then aligned by hand and imagemagick to generate interpolated frames.)
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03/17/2007 10:50:12 AM · #49 |
My third bored at work time-lapse. I promise this one is more interesting than melting ice or putting up a screen.
East Memphis Sunrise
tecnical- D200 with 105mm lens- 278 images spaced 10 sec apart - 18 sec mov.
Had to shoot thru a chain link fence with the camera 5-6 inches away, hence the centered composition. |
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